On 12-01-20 10:05 AM, Alex van der Spek wrote:
First time ever that I try to call subroutines in a Win DLL using R. Have done this before using VBA and Python.The C code's function argument list contains only double pointers (double *x). The function is declared void, the output value is one of the arguments. C calling sequence is used. When inspecting the exports of the DLL with dumpbin I can see that the function I need is exported under the name 'planckwR'. Loading the DLL with dyn.load(dllpath). Works fine. getLoadedDLLs() shows info on the 'Planck.dll' that I made. So far so good. Made a function i R like this: Planckw<-function(Temp) { wavelength<-0.0 .C('planckwR',as.double(Temp),as.double(wavelength)) return(wavelength) }
That will return 0.0 once you get the name sorted out; .C won't modify the variable wavelength, it will return new values in a list.
Calling this function, R complains the function 'planckwR' is not in the DLL.
I would look in the export table printed by objdump -x to check this. I don't know the dumpbin utility.
This baffled me as I can see it in the exports table using dumpbin. I use Visual C++ 97 compiler. Old but works. It does change the FPU control word, which I know it should not. Working on that one too. Any tips?
Use gcc? Duncan Murdoch
Any help much appreciated. Alex van der Spek ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
